Library　is　an　important　part　of　the　public　cultural　service　system.　Library　policy　is　a　major　force　that　can　not　be　ignored.　As　the　carrier　of　cultural　inheritance,　library　plays　an　important　role　in　cultivating　and　practicing　core　values　and　promoting　civilized　practice　in　the　new　era.　Excavating　the　theme　of　the　library　is　the　basis　for　determining　the　development　and　service　direction　of　the　library.　The　library　policy　is　facing　difficulties　such　as　unclear　construction　direction　and　inadequate　guidance.　Under　this　background,　the　research　on　China＇s　library　policy　is　carried　out.　With　the　library　as　an　example,　the　topic　mining　and　quantitative　analysis　of　library　policies　in　the　eastern,　central,　and　western　regions　of　my　country　from　2011　to　2020　were　conducted　using　the　LDA　topic　model.　Meanwhile,　the　differences　between　the　three　regions　were　investigated.　The　results　demonstrate　that:　(1)　In　terms　of　quantity,　policy　texts　in　the　eastern　region　account　for　more　than　half　of　them;　(2)　Regarding　keywords,　high-frequency　words　mainly　include　culture,　openness,　and　information　in　the　eastern　region,　numbers,　resources,　and　reading　in　the　central　region,　and　students,　teaching,　and　learning　in　the　western　region;　(3)　The　hot　topics　in　the　eastern　region　involve　library　government　affairs,　library　digital　resources,　and　library　service　mode,　that　is,　strengthening　the　construction　of　library　digital　resources　and　improving　service　level　with　an　open　attitude;　(4)　The　hot　topics　in　the　central　region　contain　library　management,　library　student　training,　and　library　security,　suggesting　that　the　aspects　of　internal　management　and　system　security　are　emphasized　to　train　students　and　guide　the　modernization　of　the　library;　(5)　The　hot　topic　in　the　western　region　includes　the　construction　of　two　libraries　in　one　station　for　library　evaluation　management　and　library　procurement,　implying　to　promote　library　reform　from　the　bottom　up　and　make　crucial　arrangements　for　creating　a　new　situation　for　grass-roots　libraries.　On　this　basis,　the　policy　support　of　government　departments　for　library　development　in　the　future　should　focus　on　formulating　regulations　and　rules　under　the　Library　Law,　establishing　a　dynamic　balance　between　supply　and　demand,　and　enhancing　exchanges　and　cooperation　between　libraries　in　the　east,　middle,　and　west.　©　2022-IOS　Press.　All　rights　reserved.